I have been able to work one problem with the wheatstone formulas but for some reason I am missing something on working another one. I know what the answer is suppose to be but for some reason I can't seem to get there. Please see the spreadsheet where I have been doing my calculations http://quasarsvc.bizland.com/WheatstoneCircuit.xls the one I am having problems with is the one on the tab Q40 - the other problem worked out correctly. I am close but not there.